ISO 11158:2023 PDF

Lubricants, industrial oils and related products (class L) — Family H (hydraulic systems) — Specifications for categories HH, HL, HM, HV and HG

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Title (English):

ISO 11158:2023

Lubricants, industrial oils and related products (class L) — Family H (hydraulic systems) — Specifications for categories HH, HL, HM, HV and HG

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 21
Publication date:: October 13, 2023
Edition:: ISO IS 11158 edition 3 version 1
ICS:: 75.120

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Description (English):

This document specifies the minimum requirements for new mineral oil hydraulic fluids and is intended for hydraulic systems, particularly for hydrostatic hydraulic fluid power application. The purpose of this document is to guide suppliers and end users of mineral oil hydraulic fluids and to direct equipment manufacturers of hydraulic systems. This document is written in a general form so that its application can accommodate various climatic conditions. This document also stipulates the requirements for mineral-oil hydraulic fluids at the time of delivery. This document is intended to be used in conjunction with ISO 6743-4, which classifies fluids used in hydraulic applications. Among the categories covered by ISO 6743-4, only five types of mineral oil-based fluids are covered in this document. These categories are HH, HL, HM, HV and HG. This document does not cover the extreme cases of use in terms of hydraulic circuits design, temperature and extreme conditions. NOTE For use in exceptional conditions, suppliers and purchasers of lubricants can mutually agree upon additional testing methods and acceptability criteria of the products. .

Technical details

Technical committee: ISO/TC 28/SC 4 - Classifications and specifications
SKU: ISO 11158:2023

Abstract

Overview

ISO 11158:2023 - "Lubricants, industrial oils and related products (class L) - Family H (hydraulic systems)" - specifies minimum requirements for new mineral-oil hydraulic fluids used in hydrostatic hydraulic fluid power applications. This third edition (2023) replaces ISO 11158:2009 and is intended to guide suppliers, purchasers and equipment manufacturers on formulation, delivery and testing of hydraulic oils. The standard covers five mineral-oil categories: HH, HL, HM, HV and HG, and is written to accommodate a range of climatic conditions while excluding extreme or highly specialized hydraulic-system designs.

Key technical topics and requirements

Classification and scope: only mineral oil–based hydraulic fluids in categories HH, HL, HM, HV and HG (see ISO 6743-4 for classification linkage).
Performance and composition:
- HH: non-inhibited mineral oils (basic hydraulic oils).
- HL: inhibited oils with rust, oxidation and foam inhibitors.
- HM: anti-wear/extreme-pressure additives and filterability requirements.
- HV: viscosity‑modified HM oils for extended temperature range.
- HG: HM-type oils with friction modifiers for slide‑ways (anti stick‑slip).
Specification tables (Annex A): limiting values for viscosity grades (VG 10–VG 150), viscosity at 40 °C, pour point, flash point, water content, acid number, copper strip corrosion, air-release, foaming, filterability and more.
Sampling and test methods: sampling per ISO 3170 and numerous referenced test standards (e.g., ISO 3104 viscosity, ISO 2592 flash point, ISO 3016 pour point, ISO 20763 vane‑pump anti‑wear). The 2023 update introduces the VICKERS 35VQ25 anti‑wear test, hydrolytic‑stability and enhanced high‑temperature requirements.
Cleanliness and delivery state: oils must be clear, bright and free of visible particulates; cleanliness levels per ISO 4406 can be agreed between supplier and user.

Practical applications - who uses ISO 11158:2023

Lubricant manufacturers: to formulate and certify mineral hydraulic oils to market categories HH–HG.
Hydraulic equipment OEMs: to specify acceptable fluids for pumps, motors and control circuits.
Procurement teams and end users: to define purchase specifications, acceptance testing and storage/delivery criteria.
Test laboratories and QA teams: to perform standardized testing and verify compliance using the normative test methods in the standard.
Maintenance engineers: to select appropriate oil type (anti‑wear, viscosity‑stable, slide‑way) for operating temperature ranges and anti‑wear needs.

Related standards

ISO 6743-4 (classification of hydraulic fluids)
Many referenced test methods (ISO 3104, ISO 2592, ISO 3016, ISO 20763, ISO 4406, etc.)

ISO 11158:2023 is the practical reference for establishing baseline mineral-hydraulic fluid specifications - useful for specification writing, acceptance testing, supplier qualification and improving hydraulic system reliability.

Related standards

Standards mentioned in the description

Abstract

Overview

Key technical topics and requirements

Classification and scope: only mineral oil–based hydraulic fluids in categories HH, HL, HM, HV and HG (see ISO 6743-4 for classification linkage).
Performance and composition:
- HH: non-inhibited mineral oils (basic hydraulic oils).
- HL: inhibited oils with rust, oxidation and foam inhibitors.
- HM: anti-wear/extreme-pressure additives and filterability requirements.
- HV: viscosity‑modified HM oils for extended temperature range.
- HG: HM-type oils with friction modifiers for slide‑ways (anti stick‑slip).
Specification tables (Annex A): limiting values for viscosity grades (VG 10–VG 150), viscosity at 40 °C, pour point, flash point, water content, acid number, copper strip corrosion, air-release, foaming, filterability and more.
Sampling and test methods: sampling per ISO 3170 and numerous referenced test standards (e.g., ISO 3104 viscosity, ISO 2592 flash point, ISO 3016 pour point, ISO 20763 vane‑pump anti‑wear). The 2023 update introduces the VICKERS 35VQ25 anti‑wear test, hydrolytic‑stability and enhanced high‑temperature requirements.
Cleanliness and delivery state: oils must be clear, bright and free of visible particulates; cleanliness levels per ISO 4406 can be agreed between supplier and user.

Practical applications - who uses ISO 11158:2023

Lubricant manufacturers: to formulate and certify mineral hydraulic oils to market categories HH–HG.
Hydraulic equipment OEMs: to specify acceptable fluids for pumps, motors and control circuits.
Procurement teams and end users: to define purchase specifications, acceptance testing and storage/delivery criteria.
Test laboratories and QA teams: to perform standardized testing and verify compliance using the normative test methods in the standard.
Maintenance engineers: to select appropriate oil type (anti‑wear, viscosity‑stable, slide‑way) for operating temperature ranges and anti‑wear needs.

Related standards

ISO 6743-4 (classification of hydraulic fluids)
Many referenced test methods (ISO 3104, ISO 2592, ISO 3016, ISO 20763, ISO 4406, etc.)

ISO 11158:2023 PDF

Technical details

Abstract

Overview

Key technical topics and requirements

Practical applications - who uses ISO 11158:2023

Related standards

Related standards

Abstract

Overview

Key technical topics and requirements

Practical applications - who uses ISO 11158:2023

Related standards

Related standards

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